A Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
    Local Area Network (LAN) provides high-speed communications channels
    for connecting computers and other digital devices located within a
    moderate-sized geographic area. Like other LANs, the CSMA/CD LAN
    falls between long-distance, low-speed networks that carry data
    for hundreds or thousands of kilometers, and specialized, very
    high-speed intercommunications that are generally limited to tens
    of meters. The CSMA/CD LAN is intended primarily for use in such
    areas as office automation, distributed data processing, terminal
    access, distributed systems and other situations requiring
    economical connection to a local communication medium carrying
    sporadic traffic at high-peak data rates.

    For Tru64 UNIX, the DNA CSMA/CD module incorporates the functions
    and operations defined in the Ethernet Specification V2.0 and the
    ISO 8802-3 (IEEE 802.3) CSMA/CD Access Method and Physical Layer
    specification as well as parts of the ISO 8802-1 (IEEE 802.1)
    Addressing, Internetworking, and Network Management and the ISO
    8802-2 (IEEE 802.2) Logical Link Control specifications. To this
    the DNA CSMA-CD module adds features often needed by users of the
    Data Link. A typical such Data Link user is the Network Layer of
    the DNA.